Center stop-motion for looms



C. P. BERGSTROM CENTER STOP-MOTION FOR LOOMS Dec. 24, 1940.

Filed Jan. 9, 1940 INVENTOR CARL R BERGSTROM ATTORNEY Patented Dec. 24, 1940 PATENT OFFICE CENTER s'roP-Mo'rIoN FOR LooMs Carl .PJBergStr'Om, Millbury; Mass, assignor to Crompton & Knowles Loom Works, Worcester,

Mass, a corporation of Massachusetts Application January .9, 1940, Serial No. 313,096

*5 Claims.

y In center- ;s'top. motions :as customarily made the.

tines of the detecting fork and the knock-off dagger are connected together positively by a link so that movement'o'f one necessarily causes 10 movement of the other. In thetknockin wffroperation'the dagger is givenlan abrupt downward motion away from the knock-off. lug on the shipper shaft or other part whichis rocked when the loom is 'toibe stopped. This motion'of the dagger is communicated to the fork and the tines of the latter are forced upwardly against the cloth being woven. In-the weaving of finer fabrics this upward motion of the fork is likely to damage the cloth.

It is an important object of my present invention to make the dagger carrierand the fork controller in two parts which are caused to move together in one direction by a positive connection when the fork is moved to detecting position, but wherein the dagger carrying part can move relatively to the second part attached to the fork so that the abrupt downward motion of the dagger will not be transmitted to the fork.

In center stop motions as customarily made there is a verticallyvreciprocating rod which attuates a positive link connection between the filling vfork and a pivoted part on thelay which has direct-engagement with the rod. It is another object of my invention to preserve this positive link connection while at the same time permitting independent movement of the dagger with respect to the link connection for the reasons already mentioned. 7

In certain looms wherein the take-up roll is relatively high there is danger that the dagger will engage the roll if 'permittedto move too far down on the forward stroke of the lay during a loom stopping operation. It is another object of my present invention to provide a stop for the dagger carrying part of the invention which will prevent engagement of the dagger with the takeup roll but be so located as to have no effect on the filling fork or the parts positively connected thereto. By this arrangement the more sensitive detecting part of the stop motion is spared the stock incident to the abrupt stopping of the dagger in its downward motion.

With these and other objects in View which will appear as the description proceeds, my invention resides in the combination and arrangement or parts hereinafter described and set forth.

In the accompanying drawing, wherein a convenient embodiment of my invention isset forth,

Fig. 1 is a vertical section through aportion of the loom equipped with my invention and showi eay in r p siti n with the fig Fig-i2 5 a i wasim ar to iebut whe ei the l y ha mov d to n t-tun p si i n an v th or r s des endedpn its d tect n st o e.

a 3 s a detai hor onta sect on on n t-M Fiabeen en ar edis a e Fi a at arie eva nta en the-d r tion of ar q l, Eta 3 Fig-15 :sh w -;nar s o th st uct e sh wn-i -v nan-enhrmd-scale. a Fi 6 its vi simil r o a p rt on of Fig. pa be ngin ectiqn to. i u trate the rela ionship betweenther aeeer arr er and the ork con ro me a t tw Re er i to thes awine t e; oom am 10 h s a b east be m 2 I un er wh c is mo nted a ha t to ':lQe': Z when t e 11 .0 1 -i zt h s e ped. 15 c red to the @shet his is ha ing a nock-of no ch abo e-wh ch is an e e han n c -w hsrtpid senga eztn d geer ltnfr m the not h d rin -melt ng a o -a. no ki -9 s fq seoithe cm The lav?!) has a reed?! .e ne-w-hi ht avel a hut le. 13 b tween tenand bott m wa p. W an De end n immtbeir iag -Q the levies-b a e ,15in w ic mou ed a a l. s aft 1 5 w whi h i e ur d a l t 12 he iat e vqta r i nn s d as at -28 t a di endin r zwi the u u mannen- .e: ur tt he sha t-Z5 r i s ma n s l whi h comprise-thedetector fork. I

, eiorveree :brett @511 exte d d-am 35 to receive and guide 'the upper endof' a rod oractuator 3.5 therlower end-of which'not shown, h ein 5 qu m i k m e oe' tu t eee e ken of t eay S new the loack.. stroke .of thelay thei'ro d 36- isgi-ven an. iipwargli motion relatively v to the bracket :25. while on the .forward' lay stroke: -.the rod moves downwardly with ,respectlto the bracket. Qn its upfstroke rod.,3.6. engages an arm .31 -pivota1 1y mountedion a-stlldltt secured to bracket gaand. av tega vot l lcer lnectioni aawith the'lowerend ofrod 29. I

Except for modifications. mgrm- 3.1 andlthe mountin for dagger [.6 to be described, thelparts thus'ifarflsetifdrth are constructed and operate in, theusual manner}- rod36-lifting the filling fork on the backward stroke of the lay by a force transmitted positively through arm 31, rod 29, plate 21 and shaft 26. The connections between link 29 and the parts to which it is pivotally attached have proved very satisfactory in long continued use, due partly to the fact that rod 36 engages arm 3". without having direct contact with the link 29.

In carrying my present invention into effect I separate the arm 3! from the dagger by providing a dagger carrier 4! into which the dagger I6 projects to be held by a set screw 42, as indicated for instance in Fig. 5. The dagger carrier has the rear end thereof forked as at 43 to receive a relatively narrow bearing 45 on arm 31.

The forks 43 extend rearwardly and overhang a portion of the arm 3'! as indicated in Figs. 3 and 6. A torsion spring 58 surrounds a part of the stud 38, one end of the spring being held to the stud and the other end being caught under the set screw 42. The effect of the spring is to hold the rear parts of the forks 43 against the broadened part of arm 31, but the spring will permit the dagger part 4| to move in a counter-clockwise direction around stud 38 to move the forks 43 away from arm 31.

In operation, rod 36 will reciprocate vertically as already described and in its upward motion will engage arm 3'! to transmit a positive force through rod 29 to the filling fork. At the same time arm 31 acts on the forks 43 to rock the dagger and its carrier in a downward direction to the position indicated in Fig. 1. So long as weft is present in the warp shed the tines of the fork will be supported in a relatively high position and the dagger will be prevented from engaging the lug l3 on the forward stroke of the'lay. When the weft thread is broken, however, the fork falls to low position due to action of spring 50 and the dagger will be raised to a position where continued forward motion of the lay will cause it to enter the notch I4. Still further forward motion of the lay causes the dagger to rock shaft l2 in a clockwise direction in Fig. 1, thereby bringing the shoulder 5 against the dagger to disengage the latter and permit continued motion of the lay.

At the instant of disengagement of the dagger from the lug the shoulder gives the dagger a quick downward motion which would have the effectin center stop motions as heretofore con structed of causing upward motion of the filling fork; Because of the fact, however, that the dagger is mounted on a carrier movable independently of the arm 31, the latter has no force communicated to it from the dagger which would tend to raise the fork. During this downward motion of the dagger the forks 43 move away from arm 31 and the latter together with the rod 29 and the fork remain substantially unchanged. When the spring acts to return the dagger to its normal up position the forks 43 again engage arm 31 to lower the fork 3|. So long as the weft remains intact the rising and falling of the rod 36 is accompanied by a corresponding rocking of the dagger and the filling fork as though these parts were a single unit, being held together by the spring. It is only when the dagger is given a downward motion that it becomes relatively disconnected from the filling fork so that the latter will not be affected or moved by the dagger.

In certainlooms having a relatively high takeup roll there is danger that if the dagger is depressed too low the forward motion of the lay will drive the dagger into the take-up roll, thereby damaging its surface. In order to prevent excess down motion of the dagger I provide an adjustable stop shown more particularly in Figs. 1, 2 and 5 comprising an extension 55 of the bracket 25 and a stop screw 56 therein mounted for vertical adjustment and held in position by a lock nut 51. The head 58 of the screw is positioned under the dagger carrier 4| a sufiicient distance to allow the dagger to clear the knock-off lug |3 but prevent it from coming in contact with the take-up roll indicated at T in Fig. 2.

From the foregoing it will be seen that I have provided a center stop motion wherein the dagger is capable of a downward motion independently of the filling fork due to the fact that the dagger carrier forks 43 move away from arm 31 without tendency to move the latter. It will further be seen that under normal conditions the spring and the forks 43, by their engagement with the arm 31, hold these two parts yieldingly together. Furthermore, the arm and fork 3| are positively connected at all times through the link 29, a condition which experience proves to be advantageous. It will further be seen that the independently movable dagger carrier 4| is restricted in its downward motion by the adjustable stop screw 56.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention andI do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a filling stop motion for a loom having a lay on which is mounted a rotatable support secured to a filling fork, the lay having a dagger for engagement with loom stopping mechanism the effect of which is to give the dagger a downward motion incident to a loom stopping operation, and the loom having an actuator which reciprocates vertically with respect to the lay, a dagger carrier pivotally mounted on the lay, a spring having one end fixed with respect to the lay and having the other end connected to the carrier and tending to raise the latter and the dagger relatively to the lay, an arm pivotally mounted on the lay, a link pivoted to the arm and connected to the rotatable support for the filling fork, and the dagger carrier and arm having mutually engaging parts to transmit a force derived from the spring through the dagger .carrier to the arm in a direction to lower said arm and the filling fork during descent of the actuator, said parts causing the dagger carrier and dagger to be lowered when said arm and link are raised by upward motion of the actuator, said carrier when given said downward motion incident to a loom stopping operation moving pivotally independently of the arm and filling fork to cause separation of said parts and thereby prevent the transmission of force from the dagger to the filling fork.

2. In a filling stop motion for a loom having a lay on which is mounted a rotatable support to which is secured a filling fork, the lay having a dagger for engagement with loom stopping mechanism the effect of which is to give the dagger a downward motion incident to a loom stopping operation, the loom having also an actuator which reciprocates vertically with respect to the lay, a stud fixed to the lay, a dagger carrier pivoted on the stud, a spring surrounding the stud having one end thereof secured to the stud and having the other end attached to the dagger carrier, said spring tending to raise the dagger and dagger carrier, an arm'also pivoted on the stud and positioned for engagement with the actuator, a rigid link connecting the arm and the rotatable support for the filling fork to be raised to lift the filling work when the actuator rises to raise said arm, the dagger carrier and arm having mutually engaging separable parts constructed to transmit a force derived from the spring through the dagger carrier to the arm to lower the latter and the filling fork during descent of the actuator, said parts having a relative movement away from each I other when the dagger is given said downward motion incident to a loom stopping operation and the carrier being movable pivotally on the stud and downwardly independent of the arm and the filling fork.

3. In a filling stop motion for a loom having a lay on which is mounted a rotatable element secured to a filling fork, the lay having a dagger for engagement with loom stopping mechanism the effect of which is to give the dagger a downward motion incident to a loom stopping operation and the lay having fixed thereto a pivotal support and the loom having an actuator which reciprocates vertically with respect to the lay during loom operation, a carrier for the dagger pivoted on the support, a spring having one end fixed with respect to the support and having the other end thereof attached to the dagger carrier, said spring tending to raise the dagger and dagger carrier and yielding to permit the aforesaid downward motion of the dagger, an arm also pivoted on the support and separate from the dagger carrier and positioned for engagement with the actuator, a link connecting the arm tothe rotatable element for the filling fork to cause the filling fork to rise when the arm is raised by upward motion of the actuator, and the dagger carrier and arm having mutually engaging parts through which the spring transmits a force tending to lower the arm and lift the dagger carrier during descent of the actuator, said parts having a relative movement away from each other when the dagger is given the aforesaid downward motion incident to a loom stopping operation to prevent transmission of force from the dagger to the arm and link and filling fork.

4. In a filling stop mechanism for a loom having a lay provided with a filling fork secured to a rotatable element mounted on the lay and the latter having a dagger for engagement of loom stopping mechanism the effect of which is to give the dagger a downward motion incident to a loom stopping operation and the loom having an actuator which reciprocates vertically with respect to the lay, a pivotal support fixed to the lay, two separate members both of which are pivoted on the support, the first member carrying the dagger, a spring having-one end fixed with respect to the support and having the other end fixed to the first named dagger carrying member and acting to exert an upward force on the latter, vthe second member being placed for direct engagement with the reciprocating actuator, a link connecting the second member motion incident to a 100m' stopping operation,

whereby said downward motion of the dagger is ineffective to raise the second member and the filling fork.

5. In a filling stop mechanism for a loom having a lay provided with a filling fork secured to rotatable element mounted on the lay, the lay having a dagger for engagement with loom stopping mechanism the effect of which is to give the dagger a downward motion incident to a loom stopping operation and the loom havin an actuator which reciprocates vertically with respect to the lay, a pivotal support fixed to the lay, a spring having one end fixed to the support, a dagger carrier pivotally mounted on the support and connected to the other end of said spring to be raised by the latter, an arm also pivoted on the support and positioned to be raised by the actuator, means connecting the arm and the rotatable element to cause said rotatable element toturn in a direction to raise the filling fork when said arm is raised by upward motion of the actuator, said carrier having a part to engage the arm to lower said arm by a force derived from the spring when the latter raises the carrier during descent of the actuator, said carrier being movable angularly on the pivotal support and said part on the carrier moving away from the arm when the daggerhas the aforesaid downward motion incident to loom stopping operation to disconnect the dagger from the arm and filling fork.

CARL P. BERGSTROM. 

